Improvement in pumps



PATENT OFFICE.

LEVIS H. DAVIS, OF WEST CHESTER, PENNSYLVANIA.

IMPROVEMENT IN PUMPS.

VSpecification forming part of Letters Patent No. 38,291, dated April28, 1863.

To all whom it may concern:

Be it known that I, LEvIs H. DAvIs, of West Chester, Chester county,Pennsylvania, have invented an Improvement in Pumps; and I do herebydeclare the following to be a full, clear, and exact description of thesaine, reference being had to the accompanying drawings, and to theletters of reference marked thereon.

My invention consists of certain improvements, fully describedhereinafter, in the barrels and valve-chests and packing of doubleactlngpumps, whereby the advantages of economy and simplicity as regardsconstruction are attained.

In order to enable others skilled in this class I will now proceed todescribe its construc- -tion and operation.

` Onreference to the accompanyingdrawings, which form a part ot' thisspecification, FigureV l is a side view, partly in section, of my improved pump; Fig. 2, a sectional plan; and Fig. 3, an exterior view ofpart otl the pump.

Similar letters refer to similar parts throughout the several views.

A represents the barrel of the pump, a the rear cover, and b the frontcover of the barrel, B being the valve-chest, C the piston, and D thepiston-rod, the latter being connected by suitable links, E, to theoperating-handle, F. A shoulder, a', is formed in the barrel midway, orthereabout, between the opposite ends of the same, the barrel being ofincreased bore from this shoulder to the cover, for the admission of thehollow cylinder G, between the inner end of which and the shoulder oointervenes the annular packing-piece H, of gumelastic or other suitablematerial.

Into the cover b, which is secured to the front end of the barrel,screws the gland or follower d of a stuffing-box, and into the sameopening of the cover a projection on the cylinder G tits loosely,suitable packingiutervening between this projection and the end of thefollower d, so that on screwing the latter into the cover b the packingfor the piston-rod and the packing El of the piston are tightenedsimultaneously, the latter packing dividing the interior of the barrelinto two chambers, I and J.

The valve-chest B, which may be secured to or form part 0I" the barrelof the pump, has

strip p, placed across the opening q, which forms a communicationbetween the said chamber L and the air-vessel N, the latter beingsecured to the top of the valve-chest and being furnished with asuitable discharge-pipe, P.

The valve-chamber K communicatesy with the rear chamber ot' the barrelthrough a passage, t, Fig. 2, and with the chamber L through the opening u, the chamber K communicating thr/Qugh a passage, t', cut in thecylinder Gr,

with the front chamber of the barrel, the

chamber K also communicating through an opening, u', with the chamberlL, and both chambers Kand K communicating, the former through theopening o, the latter through the opening c', with the suction pipe Q.The openings u and u and o and c are circular, and are beveled at theiredges, so that the latter may form appropriate seats for theball-valves. Supposing the piston C to be moving in the direction of thearrow and to be about completing its inward movement, the water in thechamber J of the barrel will be in the act of passing from that chamberthrough the passage t `into the chamber K, and thence (the valve of thelatter chamber being closed) through the opening u into the chamber L,and thence through the openin g q into the airchamber N. In the meantimethe water will be passing through the suctionA pipe Q, thence throughthe opening fu into the chamber K', and thence into the front chamber,I, of the barrel. The direction taken by theJ water on the reversemotion of the piston will be readily understood, as will also the factthat a continuous stream of water must iiow from the discharge-pipe P onimparting a reciprocating motion to the piston through the medium of thelever F. It will be seen that as the piston reciprocates the valve mwill move backward and forward in the chamber L, first closingtheopening u and then the opening u. It will also be seen that the generalarrangement of chambers and valves is of the most simple character, andthat access can readily be had to the'interior of the valve-chest.

One of the main objects of my invention' has been to dispense as far aspossible with the turning, boring, and tting which add so much to theexpense of ordinary double-acting pumps. No boring,1 of the barrel A isnecessa-ry, as the piston is never in contact with it, the barrel, aswell as the cylinder Gr', consisting of crude but properly cleansedcastings. The only portion of the pump on which it is necessary toexpend any very careful or expensive work being the piston C and its rodD, which it would be well to turn truly, and even these parts may bemade sufliciently exact without resorting to turning. As to thevalve-chests and valve-seats, sufcientexactitude can be obtained bycareful molding and casting Without resorting,` to boring or turning.

I claim as my invention and desire to secure by Letters Patent- 1. Thehollow cylinder G, arranged within the barrel A, between the cover b andpacking H, substantially as and for the purpose herein set forth. l

2. In combination with the packing H,

' cylinder G, and its projection h, the gland or LEVIS H. DAVIS. i

Witnesses WHrrEHEAD WILMER W. MILLER.

